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Using 10 grams of a 15% boric acid ointment, the pharmacist will manufacture a 12% ointment. how many milligrams of diluent is required? round the answer to the nearest wholenumbe

Respuesta :

mathmate
Use equation C1M1+C2M2=CM
C1=15%, M1=10000 mg (starting ointment)
C2=0%   M2=to be found (diluent)
C=12%   M=M1+M2 (product)

Solve for M2
0.15*10000+0*M2 = 0.12(10000+M2)
M2=(0.15-0.12)*10000/0.12=2500 mg

Answer: 2500 mg of diluent is required.

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